知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

137 条记录 (耗时 0.032 秒)

    ADAPTIVE WATER-FAT SHIFT IN NON-CARTESIAN MAGNETIC RESONANCE IMAGING
    1.
    发明公开
    ADAPTIVE WATER-FAT SHIFT IN NON-CARTESIAN MAGNETIC RESONANCE IMAGING 审中-公开

    公开(公告)号：US20240103111A1

    公开(公告)日：2024-03-28

    申请号：US18275619

    申请日：2022-01-24

    申请人： KONINKLIJKE PHILIPS N.V.

    发明人： Silke Hey ,  Giuseppe Valvano

    IPC分类号： G01R33/565 ,  G01R33/48 ,  G01R33/54

    CPC分类号： G01R33/56527 ,  G01R33/4824 ,  G01R33/543

    摘要： Disclosed herein is a medical system (100, 300) comprising a memory (110) storing machine executable instructions (120). The medical system further comprises a computational system (104). Execution of the machine executable instructions causes the computational system to: receive (200) initial pulse sequence commands (122), wherein the initial pulse sequence commands are configured for controlling a magnetic resonance imaging system (302) to acquire k-space data (332) following a non-Cartesian k-space sampling pattern (604, 604′), wherein the initial pulse sequence commands are configured for controlling the magnetic resonance imaging system to sample the non-Cartesian k-space sampling pattern by repeatedly sampling a Cartesian k-space sampling pattern (126) that is rotated for each acquisition, wherein the non-Cartesian k-space sampling pattern has an effective water-fat shift direction (606, 606′); receive (202) a chosen water-fat shift direction (124); and construct (204) modified pulse sequence commands by rotating the non-Cartesian k-space sampling pattern such that the effective water-fat shift direction is aligned with the water-fat shift direction.

    Correcting the chemical shift artifacts from bipolar DIXON MR acquisition data
    2.
    发明授权
    Correcting the chemical shift artifacts from bipolar DIXON MR acquisition data 有权

    公开(公告)号：US11879954B2

    公开(公告)日：2024-01-23

    申请号：US17851317

    申请日：2022-06-28

    申请人： Siemens Healthcare GmbH

    发明人： Mario Zeller

    IPC分类号： G01R33/565 ,  A61B5/055 ,  G01R33/48 ,  G01R33/56

    CPC分类号： G01R33/56527 ,  A61B5/055 ,  G01R33/4828 ,  G01R33/5608

    摘要： In a method for correcting chemical shift artifacts, CSA, a convolutional neural network (CNN) may be provided, which is trained using acquisition data acquired in phase and in opposed phase by a DIXON MR method that may include acquisition data that contains CSA in mutually opposite directions and acquisition data that contains CSA only in one direction. The CNN may be trained to transform acquisition data obtained by the fast DIXON MR method so the acquisition data acquired by the fast DIXON MR method exhibits CSA that arise only in the same direction. The method may further include acquiring fast DIXON MR acquisition data using respective control instructions and applying the trained CNN to the acquisition data to minimize or entirely remove the CSA and to calculate corrected acquisition data. The CSA may arise in the magnetic resonance DIXON method when using fast DIXON MR to capture the echoes.

    MR spectroscopy system and method for diagnosing painful and non-painful intervertebral discs
    8.
    发明授权
    MR spectroscopy system and method for diagnosing painful and non-painful intervertebral discs 有权
    MR光谱系统和诊断疼痛性和非痛性椎间盘的方法

    公开(公告)号：US08761860B2

    公开(公告)日：2014-06-24

    申请号：US12579371

    申请日：2009-10-14

    申请人： James Clayton Peacock, III ,  John Patrick Claude ,  Paul Henry Kane

    发明人： James Clayton Peacock, III ,  John Patrick Claude ,  Paul Henry Kane

    IPC分类号： A61B5/05

    CPC分类号： A61B5/055 ,  A61B5/407 ,  A61B5/4514 ,  A61B5/4824 ,  A61B5/7203 ,  G01R33/34069 ,  G01R33/3415 ,  G01R33/4616 ,  G01R33/485 ,  G01R33/565 ,  G01R33/56527 ,  G06F19/00

    摘要： An MR Spectroscopy (MRS) system and approach is provided for diagnosing painful and non-painful discs in chronic, severe low back pain patients (DDD-MRS). A DDD-MRS pulse sequence generates and acquires DDD-MRS spectra within intervertebral disc nuclei for later signal processing & diagnostic analysis. An interfacing DDD-MRS signal processor receives output signals of the DDD-MRS spectra acquired and is configured to optimize signal-to-noise ratio (SNR) by an automated system that selectively conducts optimal channel selection, phase and frequency correction, and frame editing as appropriate for a given acquisition series. A diagnostic processor calculates a diagnostic value for the disc based upon a weighted factor set of criteria that uses MRS data extracted from the acquired and processed MRS spectra along regions associated with multiple chemicals that have been correlated to painful vs. non-painful discs. A diagnostic display provides a scaled, color coded legend and indication of results for each disc analyzed as an overlay onto a mid-sagittal T2-weighted MRI image of the lumbar spine for the patient being diagnosed. Clinical application of the embodiments provides a non-invasive, objective, pain-free, reliable approach for diagnosing painful vs. non-painful discs by simply extending and enhancing the utility of otherwise standard MRI exams of the lumbar spine.

    摘要翻译： 提供MR光谱（MRS）系统和方法用于诊断慢性，严重腰痛患者（DDD-MRS）中的疼痛和非疼痛的椎间盘。 DDD-MRS脉冲序列产生并获取椎间盘核内的DDD-MRS光谱，用于后续信号处理和诊断分析。 接口DDD-MRS信号处理器接收所获得的DDD-MRS光谱的输出信号，并配置为通过选择性地进行最佳信道选择，相位和频率校正以及帧编辑的自动化系统来优化信噪比（SNR） 适用于给定的采集系列。 诊断处理器基于加权因子集合来计算盘的诊断值，该加权因子集合使用从与获得和处理的MRS光谱中提取的MRS数据沿着与多个化学物质相关联的区域，所述化学物质与疼痛与非痛苦盘相关。 诊断显示器提供经缩放的颜色编码的图例和针对被分析为被诊断的患者的腰椎的矢状T2加权MRI图像上的覆盖层的每个椎间盘的结果的指示。 实施例的临床应用提供了通过简单地扩展和增强腰椎否则的标准MRI检查的实用性来诊断疼痛与非痛性椎间盘的非侵入性，客观，无痛，可靠的方法。

    Method and apparatus for correcting distortion during magnetic resonance imaging
    9.
    发明授权
    Method and apparatus for correcting distortion during magnetic resonance imaging 有权
    用于校正磁共振成像期间畸变的方法和装置

    公开(公告)号：US08131048B2

    公开(公告)日：2012-03-06

    申请号：US12344922

    申请日：2008-12-29

    申请人： Guo Bin Li ,  Bi Da Zhang

    发明人： Guo Bin Li ,  Bi Da Zhang

    IPC分类号： G06K9/00

    CPC分类号： G01R33/561 ,  G01R33/4824 ,  G01R33/56509 ,  G01R33/56527 ,  G01R33/56536 ,  G01R33/56563

    摘要： In a method and apparatus for correcting distortion during magnetic resonance imaging k space data in a number of readout encoding directions, sampling points on the phase encoding lines are primarily in low frequency regions of k space and the number of such sampling points is less than that of all sampling points. A view angle tilting compensation gradient is superimposed on the axis of a layer selection gradient. The k space data acquired from the number of directions are then combined.

    摘要翻译： 在用于校正多个读出编码方向的磁共振成像k空间数据中的失真的方法和装置中，相位编码线上的采样点主要在k空间的低频区域中，并且这样的采样点的数量小于 的所有采样点。 视角倾斜补偿梯度叠加在层选择梯度的轴上。 然后组合从多个方向获得的k个空间数据。

    Method for Magnetic Resonance Imaging
    10.
    发明申请
    Method for Magnetic Resonance Imaging 有权
    磁共振成像方法

    公开(公告)号：US20110068790A1

    公开(公告)日：2011-03-24

    申请号：US12857370

    申请日：2010-08-16

    申请人： Ryan Chamberlain ,  Jang-Yeon Park ,  Michael G. Garwood

    发明人： Ryan Chamberlain ,  Jang-Yeon Park ,  Michael G. Garwood

    IPC分类号： G01R33/48

    CPC分类号： G01R33/5615 ,  G01R33/4835 ,  G01R33/5616 ,  G01R33/56527 ,  G01R33/56536 ,  G01R33/56554

    摘要： A method of magnetic resonance imaging based on rapid acquisition by sequential excitation and refocusing is provided. The method comprises turning on a first time-encoding gradient and applying an excitation pulse in the presence of the first time-encoding gradient. The excitation pulse excites magnetization sequentially along one spatial axis. Thereafter, a first refocusing pulse is applied. A second time-encoding gradient is turned on followed by a second refocusing pulse. A third time-encoding gradient is turned on and a signal is acquired in the presence of the third time-encoding gradient. The third time-encoding gradient sums to zero with the first time-encoding gradient and the second time-encoding gradient for sequential points in space.

    摘要翻译： 提供了一种通过顺序激发和重新聚焦快速获取的磁共振成像方法。 该方法包括打开第一时间编码梯度并在第一时间编码梯度的存在下施加激励脉冲。 激励脉冲沿着一个空间轴顺序地激发磁化。 此后，施加第一重聚焦脉冲。 第二次编码梯度被打开，接着是第二重新聚焦脉冲。 第三时间编码梯度被打开，并且在存在第三时间编码梯度的情况下获取信号。 第三时间编码梯度与空间中的连续点的第一时间编码梯度和第二时间编码梯度相加。